Where:
- imol1 is an integer number
- imol2 is an integer number
- move_imol2_flag is an integer number
simple interface to superposition.
Superpose all residues of imol2 onto imol1. imol1 is reference, we can either move imol2 or copy it to generate a new molecule depending on the vaule of move_imol2_flag (1 for move 0 for copy).